U.S. patent number 8,315,684 [Application Number 12/172,981] was granted by the patent office on 2012-11-20 for oximeter ambient light cancellation. This patent grant is currently assigned to Covidien LP. Invention is credited to Bradford B. Chew, Ethan Petersen, William Shea.
United States Patent | 8,315,684 |
Petersen , et al. | November 20, 2012 |
A pulse oximeter method and apparatus which provides (1) a notch filter at a distance between a modulation frequency and a common multiple of commonly used power line frequencies (50, 60, 100 and 120) and also (2) a demodulation frequency greater than a highest pulse rate of a person and lower than any harmonic of 50, 60, 100 or 120 Hz, to filter ambient light interference, while choosing an optimum demodulation frequency that avoids interference from the notch filter or from harmonics of the line interference. Also, ambient light for any low frequency interference, such as power line interference, is measured both before and after each of the light emitter wavelengths and the average of the ambient light is then subtracted from the detected signal.
Inventors: | Petersen; Ethan (Castro Valley, CA), Shea; William (Livermore, CA), Chew; Bradford B. (San Ramon, CA) |
---|---|
Assignee: | Covidien LP (Mansfield,
MA) |
Family ID: | 34861937 |
Appl. No.: | 12/172,981 |
Filed: | July 14, 2008 |
Document Identifier | Publication Date | |
---|---|---|
US 20090005662 A1 | Jan 1, 2009 | |
Application Number | Filing Date | Patent Number | Issue Date | ||
---|---|---|---|---|---|
11495415 | Jul 28, 2006 | 7400919 | |||
10787854 | Feb 25, 2004 | 7190985 | |||
Current U.S. Class: | 600/336; 600/322 |
Current CPC Class: | A61B 5/14552 (20130101); A61B 5/725 (20130101); A61B 5/14551 (20130101); A61B 5/7228 (20130101); A61B 5/7278 (20130101); A61B 5/0205 (20130101); A61B 5/7225 (20130101); A61B 5/7203 (20130101); A61B 5/02416 (20130101) |
Current International Class: | A61B 5/1455 (20060101) |
Field of Search: | ;600/310,322,323,336 |
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